Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    F321 Practice.zip
    Just attached some f321 practice worksheets.
    Offline

    0
    ReputationRep:
    (Original post by yodawg321)
    Amount of energy needed to remove an electron from each atom in one mole in a gaseous state.

    (Doubt this will come up because it came up in Jan)

    Q) Define Mole
    The amount of a substance that contains as many atoms (around 6.02214179 x 10^23) as there are in 12g of the C-12 isotope.
    Offline

    0
    ReputationRep:
    (Original post by yodawg321)
    Amount of energy needed to remove an electron from each atom in one mole in a gaseous state.

    (Doubt this will come up because it came up in Jan)

    Q) Define Mole
    The first ionisation energy of an element is the energy required to remove an electron from each atom in 1 mole of gaseous atoms to form gaseous 1+ ions
    Offline

    0
    ReputationRep:
    (Original post by MathsNerd1)
    I'm up for any questions. Explain the properties of NaCl and F2 and why the melting point is much higher in the former than the latter.


    Posted from TSR Mobile
    I'll just summarise it: basically NaCl= Giant Ionic Lattice (Ionic bonds) which has to be broken to cause melting.
    F2 molecs are simple molecular lattices that have van der Waal's forces between them that need to be broken to=melting.
    Ionic bonds are much stonger/have higher bond enthalpy than vdWs so NaCl= higher melting point than F2
    Offline

    0
    ReputationRep:
    (Original post by niniesta96)
    The amount of a substance that contains as many atoms (around 6.02214179 x 10^23) as there are in 12g of the C-12 isotope.
    Probably right, definition is use is that " A mole is the amount of substance in any compound when there are as many particles as carbon atoms in 12g of a carbon -12 isotope.
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by niniesta96)
    I'll just summarise it: basically NaCl= Giant Ionic Lattice (Ionic bonds) which has to be broken to cause melting.
    F2 molecs are simple molecular lattices that have van der Waal's forces between them that need to be broken to=melting.
    Ionic bonds are much stonger/have higher bond enthalpy than vdWs so NaCl= higher melting point than F2
    That's not too bad but you forgot about the other properties of those compounds. Like solubility and electrical conductivity.
    Offline

    0
    ReputationRep:
    (Original post by yodawg321)
    Probably right, definition is use is that " A mole is the amount of substance in any compound when there are as many particles as carbon atoms in 12g of a carbon -12 isotope.
    Yeah that is the textbook def- I was more kind of paraphrasing it
    Offline

    0
    ReputationRep:
    (Original post by MathsNerd1)
    That's not too bad but you forgot about the other properties of those compounds. Like solubility and electrical conductivity.
    Simple Covalent Structures soluble in non-polar solvents? Because V.D.W forces form between the solvent and Cl2?
    Offline

    0
    ReputationRep:
    (Original post by MathsNerd1)
    That's not too bad but you forgot about the other properties of those compounds. Like solubility and electrical conductivity.
    Yeah sorry- bit too much of a summary.

    NaCl: Soluble in polar solvents like water as H+ dipoles in water are attracted to Cl- and O- dipoles attracted to Na+ ions.
    Only conductor when molten/dissolved - giant ionic lattiece and ionic bonds are broken so ions are free to move to constitute a current.

    F2: Soluble in non-polar solvents like hexane as they form vdW's with them.
    No charged pariclees that are free to move so not a conductor of electricity
    Offline

    0
    ReputationRep:
    Describe and explain (with reference to bonding and structure) the differences in the properties of graphite and diamond.
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by yodawg321)
    Simple Covalent Structures soluble in non-polar solvents? Because V.D.W forces form between the solvent and Cl2?
    I know its soluble in non polar solvents such as hexane, but I'm not too sure about the second part :-/
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by niniesta96)
    Yeah sorry- bit too much of a summary.

    NaCl: Soluble in polar solvents like water as H+ dipoles in water are attracted to Cl- and O- dipoles attracted to Na+ ions.
    Only conductor when molten/dissolved - giant ionic lattiece and ionic bonds are broken so ions are free to move to constitute a current.

    F2: Soluble in non-polar solvents like hexane as they form vdW's with them.
    No charged pariclees that are free to move so not a conductor of electricity
    That's all correct!
    Offline

    0
    ReputationRep:
    (Original post by MathsNerd1)
    That's all correct!
    Btw what subjects are you taking?/ What are you planning to apply for at uni?.... Maths?
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by niniesta96)
    Describe and explain (with reference to bonding and structure) the differences in the properties of graphite and diamond.
    Okay lets start with graphite.
    - High melting and boiling point as its formed of covalent bonds which require a lot of energy to break.
    - Forms hexagonal layers formed of Carbon atoms but have weak intermolecular forces inbetween which are van der waals which can break easily so it is considered 'soft' and can be used as lubricants.
    - Inbetween the layers there are delocalised electrons which allows it to conduct electricity.
    - It is insoluble in polar and non-polar solvents as the covalent bonds are too strong to break.
    -Giant covalent structure.
    Diamond.
    -High melting and boiling point as its formed of strong covalent bonds which require a lot of energy to break.
    -Tetrahedral structure
    -Used as a cutting tool on drills
    -Hard because of the tetrahedral structure evenly distributing the force.
    - Can't conduct electricity as there are no delocalised electrons present as they are all localised in the covalent bonds.
    - Insoluble in both polar and non-polar substances.
    - Giant covalent structure.

    I think that's everything
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by niniesta96)
    Btw what subjects are you taking?/ What are you planning to apply for at uni?.... Maths?
    I'm taking Maths, Further Maths and Chemistry and yeah I'm going on to study Maths in October at Warwick
    Offline

    0
    ReputationRep:
    (Original post by MathsNerd1)
    Okay lets start with graphite.
    - High melting and boiling point as its formed of covalent bonds which require a lot of energy to break.
    - Forms hexagonal layers formed of Carbon atoms but have weak intermolecular forces inbetween which are van der waals which can break easily so it is considered 'soft' and can be used as lubricants.
    - Inbetween the layers there are delocalised electrons which allows it to conduct electricity.
    - It is insoluble in polar and non-polar solvents as the covalent bonds are too strong to break.
    -Giant covalent structure.
    Diamond.
    -High melting and boiling point as its formed of strong covalent bonds which require a lot of energy to break.
    -Tetrahedral structure
    -Used as a cutting tool on drills
    -Hard because of the tetrahedral structure evenly distributing the force.
    - Can't conduct electricity as there are no delocalised electrons present as they are all localised in the covalent bonds.
    - Insoluble in both polar and non-polar substances.
    - Giant covalent structure.

    I think that's everything
    Good job! Covered everything the examiners would be looking for- as long as you put into prose of course!
    Offline

    2
    ReputationRep:
    oooooo revision
    Offline

    0
    ReputationRep:
    Guys I really want an a in this was 3 marks off a b and made them up in my coursework.. Havent started revising yet. Any tips on how to prepare during the next 24hours? Xxx I really need an A! (A)


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by ladybug.hugsxoxo)
    Guys I really want an a in this was 3 marks off a b and made them up in my coursework.. Havent started revising yet. Any tips on how to prepare during the next 24hours? Xxx I really need an A! (A)


    Posted from TSR Mobile
    past papers I guess !
    • Study Helper
    Offline

    3
    ReputationRep:
    Study Helper
    (Original post by niniesta96)
    Good job! Covered everything the examiners would be looking for- as long as you put into prose of course!
    Thanks and yeah I'd put it into context at the end to make sure I get the last few marks
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.